That bulletin, highlighted by Storms and other experts as the one most crucial to patch immediately, fixes a total of five vulnerabilities in the GDI+ component of Windows. GDI+ (Graphics Device Interface) debuted in Windows XP, and is a core part of Windows Vista and the current server-side operating systems, Windows Server 2003 and Windows Server 2008.

"It's one of the foundations for graphic display in Windows," said Storms. "Anyone running XP or newer -- and who isn't these days -- will have to update."

Hackers could exploit the GDI+ bugs by sending specially-crafted image files in a variety of formats -- including EMF, GIF, WMF and BMG -- to a user via e-mail, or by convincing users to visit sites that contain malicious images files. By triggering the vulnerabilities, attackers could then follow up with additional malware to hijack the system or steal data.

"This was the one we were most concerned about last week," said Storms, referring to last Thursday, when Microsoft, as is its practice, posted an advance notice of what it would deliver today. "Then, we predicted that it was going to be a core system or component. And that's essentially what we got."

Symantec Corp. researcher Ben Greenbaum echoed Storms' concern over MS08-052. "The vulnerabilities that affect GDI+ are the most dangerous because GDI+ is used in such a large array of Microsoft and third-party software," he said in an e-mail.

There's also the potential that attackers might be able to recycle older code to craft an attack. "At least one of these vulnerabilities is very similar to one that we have seen before," said Greenbaum, "so hackers may be able to use old code or at the very least apply knowledge gained from previous attacks as a starting point for creating new malicious code."

Although MS08-052 is the most important of the four, Storms didn't see it as any more difficult to handle than a run-of-the-mill update, at least for users and administrators. "But I think there was a high level of difficulty for Microsoft, and think they had to put a fair amount of research into this. They knew it was in the operating system, but they probably weren't sure how many other applications were affected."

Of the remaining three updates, which patch one vulnerability each, Storms considered MS08-053 and MS08-054 as far less important. The two updates address bugs in Windows Media Encoder, a free Microsoft tool for converting audio and video to the Windows Media formats, or capturing live content; and in Windows Media Player 11, respectively.

"I don't find either of them highly important, because they're not going to be easy to exploit," Storms said.

MS08-055, which patches a protocol handler vulnerability in Microsoft Office -- specifically the OneNote protocol handler "onenote://" -- is another matter. "At least it's not a file format problem," said Storms, "but didn't Microsoft already learn about protocol handlers last year? They were a pretty big deal then, so why didn't they go back and look at [possible vulnerabilities] in other areas?"

Microsoft looks even more careless, Storms continued, because the vulnerability was spotted by an outside researchers, Brett Moore of Insomnia Security, rather than being reported internally.

September's security updates can be downloaded and installed via the Microsoft Update and Windows Update services, as well as through Windows Server Update Services.

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